Best Of
Re: Low water in sight glass & missing main vents (balancing issues)
@109A_5
Good catch on the sight glass drain.
Re: What saying or quote sticks with you since you were a newbie?
The electrician who my father used to hire to wire our boilers was trying to retire. Every time he showed up he'd try to teach me more about the wiring and controls of the boiler. More than anything, he left me with this, which is a little less true today than it was then but it still mostly works:
Bring an interruptible source of power to the boiler and connect the 120v wires. "After the power source, everything is either a switch or a load." He went on to say something like the switches (operating controls and safeties) are the ride and the load (gas valve) is the destination. But it was that line that gave me the A-HA moment and I've been building on that ever since.

Re: How do you know your boiler is done for? And how do you plan for replacement?
Does the system heat evenly and quietly? Your near-boiler piping has the classic "colliding header" mistake.

Re: What saying or quote sticks with you since you were a newbie?
Measure twice, cut once.
Also, why is there never enough time to do it right, but there's always enough time to go back and do it over again?

Re: We Got Steam Heat - wish I never read this book
Just FYI:
The company that told bFinacchio that they would only insulate the pipes for an additional fee, and only after the boiler's been running for a few weeks to make sure there are no insulation-ruining leaks, was mine.
Here's the boiler she wants to replace. All copper header not shown.
Apparently, unlike the company that installed her first boiler, we failed to convince her that we know what we're doing. That or we're just not up to the monumental task of replacing this EG-35.

Re: We Got Steam Heat - wish I never read this book
The problem that the Original Poster laments is common with old house owners when seeking any antiquated trade. I would use the word obsolete, but that's a bit extreme for steam plumbing.
Try getting your glue chipped glass reproduced. Or your gold leafed house numbers painted. Or find repairs to plaster molding. Tile roofing? Repair to stonework or repointing of lime-pointed bricks. Heck, try to get a chimney crown repaired.
Old materials and antiquated crafts are time-consuming and labor intensive. As materials fall from everyday use and inflation increases commodity costs, prices for what were once everyday items soar.
If you need repairs to anything that isn't readily made anymore or stocked at Home Depot you'll hunt for the rare individual who has had the interest in and has taken the time and effort to become conversant in their application and repair. You'll have to pick through the jungle of fraudsters and phoneys who just want your money to find a craftsman.
The conversant, educated and reputable tradesman probably won't be the low bidder, either. People who are trained, educated, skilled and honest have no need to bid low or work cheap.
Re: Return changes elevation and other oddities.
Nuts. Gotta bite the bullet on the traps then.
You've got enough you should get a volume discount.
Re: A 30 year water heater??
. Meanwhile it seems every day I hear of somebody replacing a water heater that's less than 10 years old
…………..and compressor/condensers that don't even make 10!!
I have a 2.5 ton outdoor R-22 unit from 1989 where the aluminum is somewhat deteriorated. I hesitate to replace it even though I have a used R-22 replacement for it!!

Re: Curious insulation exemption mentioned in the NYC Article 321 filing guide
Yeah, undoubtedly these lines are way too hot from bad traps - it's been part of the long saga to try to cajole management and the coop to do something about it even though they're fine with spending $400k+ on a new boiler. The other day I captured an image that perfectly illustrates that problem:
You can see that dropping return joining with a larger one. Care to guess which parts of the buildings have the most failed open traps? 😆
I do indeed suspect that at some point someone removed much of the insulation because the condensate was too hot. Instead of, y'know, fixing the traps, this could have been an ok temporary hack. I'm not quite sure when it happened, but as long as this is the case current relevant personnel do not accept that there are blown open traps in the building - then there'd be steam damaging the condensate pump, right?
Where this gets very interesting - no such exemption is actually in the code! This seems to only show up in the filing guide. As part of this article and the filing guide, buildings are already supposed to fix their traps. What's the backstory here?